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Post by need4speed on Mar 4, 2012 13:59:09 GMT -5
I am wanting to add a bbk to my 139qmb, what are the pro's and con's to the 80 vs. the 100cc? Been told not to go 100 cuz the rest of the bike couldn't handle the power, is this true?
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Post by need4speed on Mar 4, 2012 14:01:28 GMT -5
Also,,,,, are they both just bolt on or does one or both need other parts to make it work correctly???
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vvtr
Scoot Enthusiast
Posts: 243
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Post by vvtr on Mar 4, 2012 14:08:43 GMT -5
whats the 100cc kit??? you will probably find it isnt 100cc at all, more like 86cc.
a lot of them are badly advertised.
also be sure the kit you buy you dont need to make any crankcase mods. on some you have to machine the crankcases to get the barrel to fit.
also, just fitting the bigger bore is unlikely to make the scoot go faster - it'll make it ccelerate quicker as there will be a bit more power, but without changing the carb, cdi, exhaust and trans mods it wont miraculously turn into a speed demon lol!
is still the best mod to do to any scoot though. go for it.
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Post by need4speed on Mar 4, 2012 14:16:01 GMT -5
Well where I stand right now, wife is allowing me $175 in parts, what would be the best bank for my buck?
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Post by jmkjr72 on Mar 4, 2012 14:24:11 GMT -5
the first rule to scooter tuneing
make a seprate stash of money the wife doesnt know about for scooter tuneing
im willing to bet that she has a secret stash that she buys stuff for and us dumb guys belive when they say oh i have had that forever
if my wife ever knew how much money i spend on my scooters i would proably be a dead man but when she does say something i remind her that its cheaper then hoping up my truck
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Deleted
Deleted Member
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Post by Deleted on Mar 4, 2012 14:32:48 GMT -5
there is no true 100cc kit. biggest is 52.4mm making it 89cc with the stock crank.
i have 4000 miles now on a 50mm 82cc and it runs beautiful so no the thing about the rest of the bike not handling the power is not true.
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Post by need4speed on Mar 4, 2012 14:33:08 GMT -5
that is so true, im always on a buget, but she always ends up with new shoes or something, strange.........
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Deleted
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Post by Deleted on Mar 4, 2012 14:34:08 GMT -5
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Deleted
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Post by Deleted on Mar 4, 2012 14:37:42 GMT -5
also, just fitting the bigger bore is unlikely to make the scoot go faster - it'll make it ccelerate quicker as there will be a bit more power, but without changing the carb, cdi, exhaust and trans mods it wont miraculously turn into a speed demon lol! is still the best mod to do to any scoot though. go for it. if you go from a true 49cc to 82cc it sure does make it faster for sure my 82cc flys and the stock exhaust works fine with a stock 18mm carb and stock valve head. |
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Deleted
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Post by Deleted on Mar 4, 2012 14:40:59 GMT -5
i sure am glad i dont have a ball-n-chain telling me i cant buy scooter parts
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Deleted
Deleted Member
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Post by Deleted on Mar 4, 2012 14:50:01 GMT -5
the original design of this engine was 47mm 72cc (commonly referred to as 80cc) and it works just fine with either 47mm bore or 50mm bore (72cc and 82cc respectively)
Some companies put 39mm bores on them to go along with stupid american laws but the new ones i sell are 47mm 72cc from the factory.
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Post by need4speed on Mar 4, 2012 14:58:50 GMT -5
thank you for all the input, I have to change my factory carb, it don't have a mixture adjustment on it, what about the factory muffler?? Heard there may be a restricter in it.
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Deleted
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Post by Deleted on Mar 4, 2012 15:21:12 GMT -5
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Post by need4speed on Mar 4, 2012 15:30:05 GMT -5
What is that hose on the bottom of carb with screw in it, never seen one like that???
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Deleted
Deleted Member
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Post by Deleted on Mar 4, 2012 15:33:56 GMT -5
bowl drain
the kit i have for sale plus this carb with a #95 main jet, a uni filter, some 5.5g rollers and a timing advance cdi you can have a 50mph bike provided you weight about 175 lbs.
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